@north,
north wrote:the problem becomes when one has space that is zero Kelvin and has a energy source of heat such as a galaxy
meaning that the heat given off by the galaxy , into cold of space is not replenished or balanced , the heat is lost forever
hence the Universe becomes colder
Initially I would agree with you but there is something that is missing. You can't destroy atoms. Yes you can break them apart but you can't destroy them.
So technically even if what you say is true, what you end up with is at least hydrogen in the universe. Well we know that pretty much all stars are made out of hydrogen. In effect what you would actually get, is more stars because elements break down and are trying to revert back to hydrogen. Now not everything breaks all the way down but it doesn't matter.
Stars will always form if they can manage to scrounge up enough free elements in space to ignite the fusion reaction. In otherwords it is a cycle. The stars build up elements in the process of fusion and some blow up spitting all their elements out and others hold onto them and become super dense dying stars.
Now the problem here is the expansion rate of the universe. If it continues as it is going, then essentially it will pull even atoms apart. The space between the atoms will start to stretch thus overcoming the atomic strong force holding them together. We don't know what happens or what would happen if this were to occur. Maybe the space itself tears open and that tearing open sparks a new universe, we don't know.
To address the cold issue. Well there really is no absolute zero in space. All particles and atoms have at least some energy even in the space between the stars. It is really difficult for them to lose this last bit of energy and given enough time with gravity these particles will condense and form stars. Just like they have been for millions of years.
did I miss u >?< 
